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D( x )
4*b = 0
(5*a^2)/(4*b) <= 0
4*b = 0
4*b = 0
4*b = 0
x należy do R
(5*a^2)/(4*b) <= 0
(5*a^2)/(4*b) <= 0
5/4*a^2*b^-1 <= 0
x należy do R
x belongs to the empty set
ln((5*a^2)/(4*b)) = 0
x belongs to the empty set
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